Device for throttling steam-engines



(No Model.)

G. PARKER.

DEVICE FOR THROTTLING STEAM ENGINES. No. 313,365. Patented Mar. 3, 1885.

@I I I I w I Czar/rye Paar/(er fi 25 B,%@f@%wflay a? I i UNITED STATESPATENT OFFICE.

GEORGE PARKER, OF BAY CITY, MICHIGAN.

DEVICE FOR THROTTLING STEAM-ENGINES.

,EPECIFICA'IION forming part of Letters Patent No. 313,365, dated March3, 1885.

Application filed July 23, I884. (No model.)

To aZl whom, it may concern:

Be it known that. I, GEORGE PARKER, of Bay City, in the county of Bay,and State of Michigan, have invented new and useful Improvements inDevices for Throttling Steam- Engines; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, which form a part of thisspecification.

This invention relates to certain new and useful improvements insteam-engines, whereby the engine can be throttled instantly whendesired or in case of necessity.

The invention consists in the peculiar construetion, combination,andoperation of certain attachments to the throttle-valve of asteam-engine, which, for instance, when the whistle usually employed onmanufacturing establishments is blown for the noon-hour will instantlythrottle down the engine by means of a wire connection between thedevices for throttling and the whistle, and such wires may be laid tovarious parts of the.mill, so that in case of accident in any partthereof the wire may instantly be pulled, which will cause the engine tobe throttled.

The invention further consists in providing means for taking steam fromthe valve-case as soon as the steam has been cut off from the engine toa brake-cylinder, by means of which a brake may be brought intooperation to stop the motion of any heavy machinery where it may benecessary to employ such brake.

Figure 1 is a perspective view of the attachment to the throttle-valvestem, showing the attachment to the steam-whistle and to thebrake-cylinder. Fig. 2 is a horizontal central section through thethrottle-valve and case. Fig. 3 isavertical cross-section through thevalve and case on line or w in Fig. 2.

In the accompanying drawings, which form a part of this specification, Arepresents the steam-pipes connecting with the throttle-valve case B,and O is the throttle-valve within such case, secured to the valve-stemD, which projects through a proper stuffing-box,E, from the case, andupon the outer end of the stem D there is rigidly secured a lever, F,toone end of which is secured the counterbalance-weight G. This leverterminates in a handle, H, at the opposite end, and is provided with aspring-latch, I,

K, in the usual manner. This latch I engages. as shown in Fig. 1, with anotch in the disk L, which in the drawings is shown as two coincidentdisks, while in practice a single disk will be found equally effective.This disk is secured by means of the arms M M to the valve-case in anydesired or suitable way.

To the arm M is pivotally secured the camlever N, to the free end ofwhich is secured a rope or wire, 0, which leads to the whistle, which isusually placed on top of or outside the mill. This wire is secured, whenleading to the whistle, to the lower lever or arm, P, which actuates thevalve of the whistle Q, so that when this arm is actuated to blow thewhistle such arm will actuate the cam-lever N and force the latch I fromits engagement with the notch of the disk L, thereby releasing the leverF, when the counter-balance G will cause the valve in the case topartially rotate and throttle the engine. If desired, other-wires orropes may lead from the free end of the camlever N to different parts ofthe mill, so that in case of accident, and it becomes necessary toimmediately shut down the engine,the pulling of any of these connectionswill operate the throttle as described. It might happen that a heavypiece of mechanism might be running at a high rate of speed at the timethe engine was throttled as above described, and it becomes necessary tostop the motion of such machine,or a shaft over which it was driven.Consequently I provide a small steam-port, a, in the end of thevalve-case, to which I attach a small steam-pipe,b,the bore of which ispreferablysmaller than the port to which it is attached, in order towire-draw the steam as it passes to the brake-cylinder c, which lattermay be of any of the known constructions operating the brake d of anydesired pattern. This port a is opened and closed by agate, 0, attachedto the valve-stem, and so arranged and located with relation to thethrottle-valve that when the latter cuts off steam from the engine itdiscloses the port a.

I am aware of the Patent No. 36,699, and make no claim to theconstruction shown therein as forming part of my invention.

What I claim as my invention is-- IOO 1. In combination with thethrottle-valve of a steam-engine the valve-stem of which is providedwith a counter-balance and detent, a retaining-point for the sameconnected to and carried by the valve-case, and an oscillating lever, asN, also connected to and carried by the valve-case, and constructed andarranged to disengage the detent from the retaining-point, as and forthe purposes specified.

2. In a throttle-valve the case of which has pipes, as A, branchingtherefrom, and provided with a supplementary port, as a, the combinationof a brake-cylinder connected with said valve-case, with the valve-stemD,

valve 0 and gate O,att-ached thereto,substantially as shown anddescribed, to open a passage-way through the pipes A and simultaneouslyclose the port a,as and for the purposes specified.

3. The combination of the case B, throttle- 20 valve 0, and stem D withthe lever F, carrying the weight G, the latch I, disk L, cam-lever N,and connection 0, the parts being constructed. arranged, and operatingsubstantially as and for the purposes described.

4. The combination of the case B, throttlevalve O,and stem D with thelever F, carrying the weight G, the latch I, disk L, cam-lever N,connection O,port a,pipe b,and brake-cylinder 0, the parts beingconstructed, arranged, and 30 operating substantially as and for thepurposes specified;

GEORGE PARKER Witnesses:

FRANK S. PRATT, J OHN LYDEN.

